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Air Oxidation of Benzene to Biphenyl – A Dual Catalytic Approach

✍ Scribed by Sudip Mukhopadhyay; Gadi Rothenberg; Gilad Lando; Kasim Agbaria; Murat Kazanci; Yoel Sasson

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
82 KB
Volume
343
Category
Article
ISSN
1615-4150

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✦ Synopsis

Facile oxidative homocoupling of benzenes to the respective biphenyls is effected under moderate conditions, using air or oxygen in the presence of catalytic PdCl 2 and AcOH/AcONa as solvent. The fast regeneration of the active Pd 2+ species is accomplished by combining several oxygen-binding catalysts, such as Zr(IV), Mn(II), and Co(II) acetates. In this way, it is possible to increase the content of active oxygen in solution so that the rate of catalyst regeneration is faster than the rate of aggregation of the ªspent catalystº, Pd(0), to palladium black. The effects of various process parameters are studied and some mechanistic implications are discussed.

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